Super hard balls above "HRA90"! They excel in wear resistance, corrosion resistance, and high-temperature resistance.
"Super Hard Balls (Super Hard Spheres)" have extremely high hardness at both room temperature and high temperature, achieving HRA90 or higher. They exhibit excellent wear resistance, corrosion resistance, and high-temperature resistance, and are used not only in applications such as bearings and ball valves but also as measuring elements. We offer a wide variety of types and sizes, allowing you to choose according to your application. The hardness is HRA90 or higher, and you can specify the diameter in units of 1μm. The diameter tolerance is within 5μ, and the surface roughness is Ra0.3 or lower. 【Features】 ○ Extremely high hardness at room temperature and high temperature ○ High wear resistance ○ Chemically inert ○ Corrosion resistance and magnetic properties (slightly magnetic) 【Applications】 Used in high-performance bearings, high-temperature and high-pressure resistant ball valves, measuring elements for various measuring instruments, flow meters, dial gauge measuring elements, inner diameter sizing and expansion for wind instruments, diameter measurement jigs, hardness testers, airless spray guns, ball varnishing, and more. ★ Right now, we are offering free samples! ★ *For more details, please contact us or download the catalog.
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basic information
【Physical Properties】 ○Density (g/mm³): 15.0 ○Thermal Conductivity (W/m℃): 100 ○Electrical Resistance (μΩ/cm): 20 ○Coefficient of Linear Expansion (10⁻⁶℃⁻¹): 4.9 (20–400℃) / 5.3 (20–800℃) ○Hardness (HV30): 1600 (Vickers hardness at 20℃) ○Transverse Rupture Strength (N/mm²): 2600 (20℃) ○Fracture Toughness (MN/m³/²): 12 (20℃) ○Compressive Strength (N/mm²): 6200 (20℃) ○Young's Modulus (GPa): 630 ○Poisson's Ratio: 0.21 ○Material Composition →Tungsten Carbide: 93.5–94.5% →Cobalt: 5.5–6.5% (ISO-K20) (Can also be produced with Nickel) ●For more details, please contact us or download the catalog.
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Applications/Examples of results
【Applications】 ○ High-performance bearings, high-temperature and high-pressure corrosion-resistant ball valves, measuring elements for various measuring instruments, flow meters, dial gauge measuring elements, inner diameter measurement for wind instruments and expansion, caliber measurement jigs, hardness testers, airless spray guns, ball varnishing, in environments requiring cleanliness such as food and medical fields. ● For more details, please contact us or download the catalog.
catalog（1）
Download All Catalogs![[Free Sample] Hardness HRA90 or above 'Super Hard Ball (Super Hard Sphere)'](https://image.mono.ipros.com/public/catalog/image_generated/01/901/318236/318236_IPROS4000834946554297385_1.jpg?w=120&h=170)
Company information
Kyoei Shokai Co., Ltd. has been selling measuring tools and cutting tools to specific users since its establishment in 1970. In the modern global economy, we cherish Japanese manufacturing while maintaining the same spirit of fostering communication between people that we had at the time of our founding. We strive to build human relationships and also to enter new business ventures. Even as times change, communication between people remains universal, and we believe that new technologies are merely means to make life and actions more convenient for people. It is essential that we cannot move forward without "trust." Kyoei Shokai aims to prioritize relationships built on trust, with "action and execution" as our foundation, and we wish to cherish the smiles of our customers on the other side of the door.
![True ball processing [Shaping soft to hard materials into a round form!] *Local production is also possible in China.](https://image.mono.ipros.com/public/product/image/d6a/2000209865/IPROS1770634254423427367.jpg?w=280&h=280)